Carburetor Ice Detection System - Piper Dakota PA-28-236 Pilot Operating Handbook

PIPER AIRCRAFT CORPORATION
PA-28-236, DAKOTA
The FAN switch allows operation of the fan with the air conditioner
turned OFF to aid cabin air circulation if desired. A "LOW," "MED" or
"HIGH" flow of air can be selected to the air conditioner outlets located in
the overhead duct. The outlets can be adjusted or turned off by each occupant
to regulate individual cooling effect.
The "DOOR OPEN" indicator light is located to the left of the radio
stack in front of the pilot. The light illuminates whenever the condenser door
is open and remains on until the door is closed.
A circuit breaker located on the circuit breaker panel protects the air
conditioning electrical system.
Whenever the throttle is in the full throttle position, it actuates a micro
switch which disengages the compressor and retracts the scoop. This is done
to obtain maximum power and maximum rate of climb. The fan continues to
operate and the air will remain cool for approximately one minute. When the
throttle is retarded approximately 1 / 4 inch, the clutch will engage and the
scoop will extend, again supplying cool, dry air.

7.41 CARBURETOR ICE DETECTION SYSTEM

A carburetor ice detection system is available as optional equipment.
The system consists of a control box mounted on the instrument panel, a
probe sensor mounted in the carburetor and a red warning light to indicate
the presence of ice in the carburetor.
If ice is present apply full carburetor heat. Refer to 3.22, Carburetor
Icing, in the emergency procedures.
To adjust the system for critical ice detection first turn on the airplane's
master switch and then turn on the ice detection unit. Turn the sensitivity
knob fully counter clockwise causing the carb ice light to come on. Now
rotate the sensitivity knob back (clockwise) until the ice light just goes out.
This establishes the critical setting.
This instrument is approved as optional
equipment only and flight operations should not
be predicated on its use.
ISSUED: JUNE 1, 1978
REVISED: AUGUST 1, 1980
DESCRIPTION & OPERATION
WARNING
SECTION 7
REPORT: VB-910
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